Disclaimer : This tutorial is meant for beginners and for anyone who find it useful. The main purpose of this post to keep everything i find useful for future reference for myself and for others.

SQL statement to update top N records

update daily_sales
set is_calc='Y'
from daily_sales
inner join (select top 100 * from daily_sales where product_category='CA') a
on a.unique_record_id=daily_sales.unique_record_id
and a.milestone_code=daily_sales.milestone_code